Hello,
I have troubles with this FXSAVE/FXRSTOR not only on qemu/kvm,
but with some older hardware too (HP server).
Maybe this tivoli workaround should be disabled for all and enabled
only for tivoli.
SAL
On Thu, Oct 27, 2016 at 12:13:51AM +0200, Laszlo Ersek wrote:
> This prevents KVM guests from crashing that run iPXE on host CPUs without
> "unrestricted_guest" support.
>
> Once KVM gets the FXSAVE / FXRSTOR emulation feature (*), and the feature
> becomes widely available to users, we can back out this change from iPXE.
>
> (*) Already in progress by Radim:
>
> [PATCH 0/2] KVM: x86: emulate fxsave and fxrstor
>
> https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1258895.html
> https://www.spinics.net/lists/kernel/msg2370327.html
>
> Cc: Bandan Das <b...@redhat.com>
> Cc: Gerd Hoffmann <kra...@redhat.com>
> Cc: Greg <rollenwi...@yahoo.com>
> Cc: Michael Brown <mc...@ipxe.org>
> Cc: Michael Prokop <launch...@michael-prokop.at>
> Cc: Paolo Bonzini <pbonz...@redhat.com>
> Cc: Peter Pickford <a...@netremedies.ca>
> Cc: Radim Krčmář <rkrc...@redhat.com>
> Ref: https://bugs.archlinux.org/task/50778
> Ref: https://bugs.launchpad.net/qemu/+bug/1623276
> Ref: https://bugzilla.proxmox.com/show_bug.cgi?id=1182
> Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1356762
> Signed-off-by: Laszlo Ersek <ler...@redhat.com>
> ---
> src/config/qemu/general.h | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/src/config/qemu/general.h b/src/config/qemu/general.h
> index 30f60d3f704a..a084497359fe 100644
> --- a/src/config/qemu/general.h
> +++ b/src/config/qemu/general.h
> @@ -8,3 +8,8 @@
>
> /* Work around missing EFI_PXE_BASE_CODE_PROTOCOL */
> #define EFI_DOWNGRADE_UX
> +
> +/* The Tivoli VMM workaround causes a KVM emulation failure on hosts
> + * without unrestricted_guest support
> + */
> +#undef TIVOLI_VMM_WORKAROUND
> --
> 2.9.2
>
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